I would love to allow the blackstone obelisks to generate in Infernal Expansion's glowstone canyons, but currently there's no way I can do that. An ability to make it so that certain structures can spawn in certain biomes would be great.

On the subject of config options, It would also be nice to be able to blacklist certain biomes or dimensions from spawning structures. Having these structures in the Twilight Forest kinda ruins the immersion of the Twilight forest, making it feel too much like The Overworld.